JP3123862B2 - Camera viewfinder structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a camera with a finder.
Lens, especially when the taking lens is
It relates to a movable camera.

[0002]

2. Description of the Related Art In recent years, an automatic exposure function, an auto focus function,
2. Description of the Related Art Cameras provided with a strobe function, a film feeding function, and the like have become widespread. It is desirable that a so-called compact camera, which is a popular camera of this kind, be portable and convenient so that photographing can be performed at any time. For example, a compact camera that is small enough to be stored in a handbag of a woman or a breast pocket of a man's shirt does not become bulky and does not feel weight when carried.

[0003] In order to improve portability, some conventional compact cameras have a retractable photographic lens so that the photographic lens is buried in the camera body when being carried.

[0004]

However, when trying to reduce the depth of the above-mentioned conventional compact camera, that is, to make it thinner, there is a limit due to the structure of the finder. That is, in this kind of compact camera,
An inverted Galileo finder is used, and when the camera is made thinner, the magnification of the finder becomes smaller and it becomes difficult to confirm the subject, so that a predetermined thickness is required.

[0005] Further, even if the magnification of the finder is kept at a predetermined size while the thickness is reduced, the distance from the eyepiece of the finder to the photographer's pupil and the size of the pupil cannot be changed. For this reason, when the photographer looks into the finder of the magnification, a slight change in the position of the pupil may cause vignetting, making it difficult to confirm the subject.

Accordingly, an object of the present invention is to provide a finder structure which does not reduce magnification and does not cause vignetting even when the camera is made thinner.

[0007]

According to another aspect of the present invention, there is provided a camera with a finder according to the present invention .
La is retracted with the shooting lens housed in the camera body,
Shooting state with this shooting lens protruding from the camera body
Camera that can move the taking lens between
At least one of Indah objective or eyepiece
Re or one, the camera body, by movably supported in the direction of the optical axis of the lenses, comprising a viewfinder with a variable spacing between the objective lens and the eyepiece, the
The photographing lens moves from the retracted state to the photographable state
The object lens is captured by setting the objective lens and the eyepiece in a predetermined optical relationship by increasing the distance between the objective lens and the eyepiece in conjunction with the photographing lens.
The main feature is that both the objective lens and the eyepiece are housed in the camera body by narrowing the interval in conjunction with moving from the photographable state to the collapsed state, and
The retracted state with the taking lens housed in the camera body
Between the shooting state with the shadow lens protruding from the camera body
Camera that can move the shooting lens
Of the objective lens with respect to the camera body.
It is movably supported in the direction of the optical axis and is in contact with this objective lens.
Equipped with a finder with variable distance between eye lenses
The shooting lens moves from the retracted state to the
In conjunction with the distance between the objective lens and the eyepiece
Make the objective lens and eyepiece lens
Set the optical relationship to capture the subject,
Moves from the shooting enabled state to the collapsed state
By narrowing the above distance, the objective lens is stored in the camera body
It is characterized by that.

When the camera is used for photographing, the movable one of the objective lens and the eyepiece is moved,
These intervals are widened to make the movement range almost maximum. In this state, one or both of the objective lens and the eyepiece protrude from the camera body, and these have a predetermined optical relationship and the diopter of the finder is set, so that the subject can be captured at a predetermined magnification. . Also, the objective lens
In a structure that moves only the objective lens,
The moving direction is the same as the moving direction of the taking lens.
Therefore, these interlocking mechanisms can be simplified.
You.

For example, in an inverted Galileo finder, if a lens mount holding an objective lens is slidably supported by a lens mount holding an eyepiece, the sliding allows the lens mount to move between the eyepiece and the objective lens. , Ie, these optical relationships can be changed.

In a real image type finder, if an objective lens and an eyepiece are movably supported in an optical axis direction with respect to an erect optical system such as an erect prism, the objective lens and the eyepiece are moved by the movement. The optical relationship with the lens can be changed.

[0010]

When carrying a camera equipped with this viewfinder, the mount holding the objective lens or the eyepiece is moved, and the distance between the objective lens and the eyepiece is reduced to minimize the movement range. State. In this state, both the objective lens and the eyepiece are buried in the camera body.

When the camera is used for photographing, the movable one of the objective lens and the eyepiece is moved,
These intervals are widened to make the movement range almost maximum. In this state, one or both of the objective lens and the eyepiece protrude from the camera body, and these have a predetermined optical relationship and the diopter of the finder is set, so that the subject can be captured at a predetermined magnification. .

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a camera with a finder according to the present invention.

FIG. 1 shows an inverted Galileo finder having this structure, and an objective lens 1 and a semi-transparent mirror 2 are shown.
Are held by a guide mount 3 fixed to a camera body (not shown). On the other hand, the eyepiece 4 is held by a lens mount 5. The lens mount 5 is slidably supported by the guide mount 3, and the sliding causes the eyepiece 4 to move in the direction of the optical axis S.

The sliding of the lens mount 5 with respect to the guide mount 3 is achieved, for example, by forming a guide groove 3a in a direction parallel to the optical axis S on the inner surface of the guide mount 3, and forming the objective lens 1 on the outer surface of the lens mount 5. This can be achieved by forming a protrusion 5a at the end on the side and engaging the protrusion 5a with the guide groove 3a.

When the lens mount 5 is located closest to the objective lens 1, the length from the front end of the guide mount 3 to the rear end of the lens mount 5 is smaller than the depth of the camera body (not shown). It is made to become.
That is, in a state where the distance between the objective lens 1 and the eyepiece lens 4 is narrowed and the moving range is almost minimized, the finder having this structure is housed in the camera body. Also,
Pull out the lens mount 5 from the guide mount 3,
In a state where the distance between the objective lens 1 and the eyepiece lens 4 is widened and the movement range is almost maximized,
Reference numeral 4 indicates a predetermined optical relationship so that there is no shift in diopter and the image of the subject can be clearly checked. Note that, at a position where there is an optical relationship without a shift in diopter, that is, at a position where the distance between the objective lens 1 and the eyepiece 4 is widened and maximized,
It is desirable to provide a stopper or the like for stopping the sliding of the lens mount 5.

That is, when photographing, the lens mount 5 is pulled out of the guide mount 3 to increase the distance between the objective lens 1 and the eyepiece 4, and when not photographing, the lens mount 5 is buried in the guide mount 3 so as to be buried in the camera body. To reduce the depth.

FIGS. 2 and 3 are schematic longitudinal sectional views showing a state in which the finder having the structure shown in FIG. 1 is incorporated in the camera body 10, and a photographing lens 11 is disposed substantially at the center of the camera body 10. The photographic lens 11 is held by a lens barrel 12, there a so-called collapsible this barrel 12 infested photographic lens 11 by moving along the optical axis S ₀ is the camera body 10. FIG. 2 shows a state in which the camera is not used for photographing with the photographing lens 11 collapsed, and FIG.
Indicates a state in which the camera can be used for photographing with the photographing lens 11 advanced from the retracted position to the photographing position.

The finder is disposed above the camera body 10, and a protective window plate 15 is provided in front of the objective lens 14 for fixing the camera body 10 to protect the objective lens 14. . An eyepiece barrier 17 made of a pair of plate members is provided at the back of the eyepiece 16 so as to be freely opened and closed.
The eyepiece barrier 17 has an upper part and a lower part which are rotatably supported and slightly slidable along the optical axis S, respectively.
As shown in FIG. Note that a semi-transparent mirror 18 is provided behind the objective lens 14.

The eyepiece 16 is slidably provided in the direction of the optical axis S. The sliding changes the distance between the eyepiece 16 and the objective lens 14.
That is, when the camera is not taking a picture, the distance between the objective lens 14 and the eyepiece 16 is narrowed and the movement range is almost minimized, and the eyepiece 16 is housed in the camera body 10 and the eyepiece barrier 17 is moved. It is closed, and the eyepiece barrier 17 is opened at the time of photographing, so that the distance between the objective lens 14 and the eyepiece 16 is widened and the movement range is almost maximized, so that the eyepiece 16 projects rearward from the camera body 10. Then, with the objective lens 14 and the eyepiece 16 protruding rearward,
Are in a predetermined optical relationship so that the diopter of the finder does not shift and the image of the subject can be clearly checked.

The sliding operation of the eyepiece 16 can be linked to the movement of the photographing lens 11 between the retracted position and the photographing position. That is, when the photographic lens 11 is retracted to the retracted position, the eyepiece 16 is housed in the camera body 10 and the eyepiece barrier 17 is closed, and when the photographic lens 11 is advanced to the shooting position, the eyepiece barrier 17 is closed. Open so that the eyepiece 16 protrudes.
The eyepiece 16 should be manually slid .
You can also.

According to the embodiment shown in FIGS. 2 and 3, when the object is observed while the eyepiece 16 is slid in the direction of the optical axis S to project from the camera body 10 at the time of photographing, the object can be obtained. The lens 14 and the eyepiece 16 have a predetermined optical relationship, and a clear image can be seen without a shift in diopter. Further, if the eyepiece 16 is housed in the camera body 10 when the camera is carried, the depth of the camera becomes small and the camera is convenient to carry. In addition, by combining the camera with the retractable photographing lens 11, the depth of the camera can be reduced, that is, the camera can be further reduced in thickness.

FIGS. 4 and 5 show a structure in which an objective lens 21 of a finder is slidably supported.
The mount 21, the semi-transparent mirror 22, and the protective window plate 23 are held by one mount 21a, and this mount 21a is slidable in the optical axis S direction with respect to the camera body 20. The eyepiece 24 is located behind the semi-transparent mirror 22 on the optical axis S. The taking lens 25 is of a retractable type.

When the camera is used for photographing, the photographing lens 25 advances from the retracted position to the photographing position, and the objective lens 21 of the finder advances together with the mount 21a and projects forward of the camera body 20. . In this state, the distance between the objective lens 21 and the eyepiece 24 is widened and the movement range is almost maximized.
Is a predetermined optical relationship, and when the subject is observed through the viewfinder, there is no shift in diopter, and the image of the subject can be clearly confirmed.

When the camera is not taking a picture, the taking lens 25 is not used.
Retreats to the retracted position, the objective lens 21 is housed in the camera body 20, and the distance between the objective lens 21 and the eyepiece 24 is reduced, so that the movement range is almost minimized. In this state, the depth of the camera is substantially minimized, and it is convenient to carry.

The objective lens 21 is configured to advance and retreat in conjunction with the advance and retreat operation of the photographing lens 25 . What
Oh, with structure to pull out and push in manually
You can also.

FIGS. 6 and 7 show a structure in which the objective lens 31 advances and retreats together with the photographing lens 32. FIG. The mount 31a holding the objective lens 31 and the lens barrel 32a holding the taking lens 32 are held by a holding case 33 slidably provided along the optical axis S with respect to the camera body 30. . The sliding of the holding case 33 causes the taking lens 32 to slide.
Is moved between the retracted position and the photographing position, and the objective lens 31 is moved forward and backward.

The mount 31a holds a protective window plate 34 and a semi-transparent mirror 35. An eyepiece 36 is arranged on the optical axis S behind the semi-transparent mirror 35.

When the camera is used for photographing,
The holding case 33 is advanced with respect to the camera body 30. Holding case 33
When the lens moves forward, the photographing lens 32 is positioned at the photographing position, the objective lens 31 moves forward, and the distance between the lens and the eyepiece 36 increases, and the moving range becomes almost the maximum. In this state, if the subject is observed through the viewfinder, the objective lens 31 and the eyepiece 36 have a predetermined optical relationship, so that there is no shift in diopter and the image of the subject can be clearly confirmed.

When carrying a camera, a holding case 33 is provided.
If you retract the camera and store it in the camera body 30, the shooting lens
32 retracts to the retracted position, and the eyepiece 31 moves to the camera body 30.
, And the depth of the camera is reduced, making it convenient to carry. In the structure shown in FIG. 6 and FIG.
The sliding of the taking lens 32 and the objective lens 31 caused by sliding
Therefore, these lenses 32 and 31 can be reliably connected with a simple structure.
Can be moved.

FIGS. 8 and 9 show the present invention applied to a variable magnification inverted Galileo finder.

In the embodiment shown in FIG. 8, the objective lens 41 is constituted by an objective convex lens 41a and an objective concave lens 41b.
A semi-transparent mirror 42 and an eyepiece 43 are provided behind the objective lens 41. The objective convex lens 41a is fixed and held at the distal end of the guide mount 44, and the objective concave lens 41b
Is held by a lens mount 45 slidably supported along the optical axis S with respect to the guide mount 44. The finder magnification is changed by moving the objective concave lens 41b in the direction of the optical axis S. FIG. 8 shows a state where the magnification is low for standard use. When the magnification is high for telephoto, the objective concave lens 41b is retracted and positioned near the semi-transparent mirror.

The semi-transparent mirror 42 and the eyepiece 43 are held by a slide mount 46. The slide mount 46 is slidably supported by the guide mount 44 along the optical axis S. This sliding of the slide mount 46 with respect to the guide mount 44 changes the distance between the objective lens 41 and the eyepiece 43. When the distance is widened and the movement range is almost maximum, the diopter shifts. So that there is no

This finder has a variable focus such as a so-called bifocal switching function and a zoom function, in which a photographic lens (not shown) advances and retreats in the optical axis direction, and a focal length can be changed by inserting a converter lens into the optical axis as necessary. It is mounted on a camera equipped with the device.

When the camera is used for photographing, the slide mount 46 is pulled out with respect to the guide mount 44. In this state, the eyepiece 43 projects rearward from a camera body (not shown), the distance between the objective lens 41 and the eyepiece 43 is widened, the movement range is almost maximized, and the diopter is set. . When taking a picture with a short focus, the objective concave lens 41b is advanced to the vicinity of the objective convex lens 41a as shown in FIG. 8, and when taking a picture with a long focus, the objective concave lens 41b is retracted to near the semitransparent mirror 42. . The movement of the objective concave lens 41b for changing the finder magnification is performed in conjunction with the movement of the photographing lens.

When the camera is not used for photographing, the slide mount 46 is advanced with respect to the guide mount 44,
The distance between the objective lens 41 and the eyepiece 43 is reduced to substantially minimize the moving range. In this state, the eyepiece 43
Is stored in the camera body and the depth of the camera is reduced, making it convenient to carry. When the camera is not used for photographing, the photographing lens retreats to the short focal length side or the retracted position in the retractable type, and the viewfinder has the objective concave lens 41b on the objective convex lens 41a side as shown in FIG. From
The slide mount 46 can be easily advanced with respect to the guide mount 44 without the objective concave lens 41b becoming an obstacle. Guide mount 44 for slide mount 46
Advance and retreat is, dividing a line in conjunction with a shooting lens to
It is like that. Note that you can manually advance and retreat
You can also.

FIG. 9 shows an objective lens 51 composed of an objective convex lens 51a and an objective concave lens 51b, a semi-transparent mirror 52, and an eyepiece 53, similarly to the variable magnification structure of FIG. The objective convex lens 51a is held by a guide mount 54, and the objective concave lens 51b is held by a lens mount 55 slidably supported in the direction of the optical axis S with respect to the guide mount 54. Further, the semi-transparent mirror 52 has a slide mount 56 slidably supported in the direction of the optical axis S with respect to the guide mount 54.
And the eyepiece 53 is mounted on the slide mount
It is held by a slide mount 57 slidably supported in the direction of the optical axis S with respect to 56. This slide mount
The sliding between the objective mount 51 and the eyepiece 53 is changed by the sliding of the guide mount 54 with the guide mount 54 and the sliding of the slide mount 57 with the slide mount 56. When the maximum is almost reached, the diopter is not shifted.

This finder is mounted on a camera provided with a variable focus device capable of changing the focal length of the taking lens.

When the camera is to be used for photographing, the slide mount 56 is pulled out from the guide mount 54, and the slide mount 57 is further pulled out from the slide mount 56 to obtain the state shown in FIG. In this state, the eyepiece
The state in which the lens 53 projects rearward from the camera body (not shown) is provided, the distance between the objective lens 51 and the eyepiece 53 is increased, and the diopter is set by substantially maximizing the movement range. When taking a picture with a short focus, the objective concave lens 51b is advanced to the vicinity of the objective convex lens 51a. When taking a picture with a long focus, as shown in FIG.
To the vicinity of. The movement of the objective concave lens 51b for changing the finder magnification is performed in conjunction with the movement of the photographing lens.

When the camera is not used for photographing, the slide mount 57 is advanced with respect to the slide mount 56,
The slide mount 56 is advanced with respect to the guide mount 54 so as to reduce the distance between the objective lens 51 and the eyepiece 53 so as to substantially minimize the moving range. In this state, the eyepiece 53 is housed in the camera body and the depth of the camera is reduced, so that it is convenient to carry. When the camera is not used for photographing, the photographing lens is retracted and is located at the short focal length side or at the retracted position in the retractable type, and since the objective concave lens 51b is located at the objective convex lens 51a side, the objective concave lens 51b Slide mount 56 without any obstacles
Can be easily advanced with respect to the guide mount 54. Forward and backward relative to the guide mount 54 of the slide mount 56, so the row of dividing in conjunction a shooting lens
It is. In addition, it is necessary to manually advance and retreat
Can also.

FIG. 10 shows a case where this finder structure is applied to a real image type finder. A condenser lens 62 and a roof prism 63 are provided behind the objective lens 61, and a field frame plate 64 is provided on the exit side of the roof prism 63. Further, the image of the subject transmitted through the field frame plate 64 is reflected by the two reflecting mirrors 65 and 66 and is observed through the eyepiece 67.

The objective lens 61 is a slide mount 61a.
The slide mount 61a is guided by a guide rail 63b formed at the front end of a prism housing 63a holding a roof prism 63, so that the objective lens 61
It is slidably supported in the direction of the optical axis S _1. Therefore, the finder magnification is changed by sliding the slide mount 61a with respect to the prism housing 63a.

The reflecting mirrors 65 and 66 and the eyepiece 67 are housed in a mirror housing 67a, and the mirror housing 67a is moved relative to the prism housing 63a by the optical axis S.
_It is slidable in _two directions. Therefore, by sliding the mirror housing 67a and the slide mount 61a with respect to the prism housing 63a, the optical relationship between the objective lens 61 and the eyepiece 67 is changed.

When the camera provided with the finder is used for photographing, the slide mount 61a is slid forward and the mirror housing 67a is slid rearward with respect to the prism housing 63a to obtain the state shown in FIG. . In this state, the objective lens 61 and the eyepiece 67 have a predetermined optical relationship, and the diopter is set. In this state, the eyepiece 67 projects rearward from the camera body (not shown).

When the camera is not used for photographing,
From the state shown in FIG. 10, with respect to the prism housing 63a,
Retract the slide mount 61a and move the mirror housing 67
Move a forward. This makes the optical relationship between the objective lens 61 and the eyepiece 67 irrelevant and the eyepiece
The camera 67 is housed in a camera body (not shown), and the depth of the camera is reduced, making the camera portable.

[0045]

As described above, according to the present invention, full according to the present invention
According to the camera with the indexer, one or both of the objective lens and the eyepiece can be freely moved in the optical axis direction, the distance between the objective lens and the eyepiece is increased at the time of photographing, and the objective lens and the eyepiece are increased. Are set in a predetermined optical relationship to check the subject, so that there is no shift in the diopter of the finder at the time of shooting, and the image of the subject becomes clear at an appropriate magnification. In addition, since the distance between the objective lens and the eyepiece can be set to a predetermined size, vignetting does not occur. In addition, at the time of non-shooting, both the objective lens and the eyepiece are housed in the camera, so that the camera can be made thinner and portable without being bulky. Also, objective lens
Lens or eyepiece moves with the taking lens
Because it moves in the direction,
The viewfinder can also capture the subject and is collapsed
The viewfinder is in a state where the lens is stored
Requires a separate operation to move the viewfinder
do not do.

[Brief description of the drawings]

FIG. 1 is a first viewfinder structure of a camera according to the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating a schematic configuration of an embodiment, in which an eyepiece is configured to be slidable.

FIG. 2 is a second viewfinder structure of the camera according to the present invention;
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic longitudinal sectional view of a camera provided with a finder having this structure, showing an embodiment, in which an eyepiece is configured to be slidable and the camera is not photographed.

FIG. 3 shows a case where the camera of the second embodiment is in a state where it can be used for photographing.

FIG. 4 is a view showing a third embodiment, and is a schematic longitudinal sectional view of a camera provided with a finder having this structure, in which an objective lens is configured to be slidable and the camera is not photographed. I have.

FIG. 5 shows a case where the camera of the third embodiment is in a state where it can be used for photographing.

FIG. 6 is a view showing a fourth embodiment, and is a schematic longitudinal sectional view of a camera provided with a finder having this structure, in which an objective lens is configured to be slidable, and the camera can be used for photographing. This shows the case where the state is set.

FIG. 7 is a plan view of the fourth embodiment, showing a case where the camera is in a state where it can be used for photographing.

FIG. 8 shows a fifth embodiment, and is a schematic diagram of a configuration in which this structure is used in an inverted Galilean type variable magnification finder, in which an eyepiece is slidably formed.

FIG. 9 is a schematic view showing a sixth embodiment in which this structure is used in an inverted Galilean type variable magnification finder, in which an eyepiece and a semi-transparent mirror are slidably arranged separately. It is.

FIG. 10 is a schematic view showing a seventh embodiment in which this structure is used in a real image type finder, in which both an objective lens and an eyepiece are slidably formed.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-75043 (JP, A) JP-A-1-217432 (JP, A) JP-A-3-212629 (JP, A) 98429 (JP, U) Hikaru 2-7631 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) G03B 13/02-13/14 G03B 17/04

Claims (2)

(57) [Claims] 1. A collapsible lens housing a photographing lens in a camera body.
State and shooting with this shooting lens protruding from the camera body
A camera that can move the taking lens between
hand, At least the viewfinder objective or eyepiece
Either of these lenses should be
It is supported movably in the direction of the optical axis,
Equipped with a finder with variable distance between eyepieces, The photographing lens moves from a collapsed state to a photographable state
In conjunction with the distance between the objective lens and the eyepiece
The objective lens and eyepiece by increasing
Capture the subject by setting the optical relationship of The photographing lens moves from a photographable state to a retracted state.
In conjunction with this, the above-mentioned interval is narrowed and the objective lens and eyepiece
Each lens is stored in the camera body
Camera with viewfinder. 2. A collapsible lens housing a photographing lens in a camera body.
State and shooting with this shooting lens protruding from the camera body
A camera that can move the taking lens between
hand, Insert the viewfinder objective lens into the camera body
The objective lens is movably supported in the optical axis direction of the object lens.
Viewfinder with variable distance between lens and eyepiece
With The photographing lens moves from a collapsed state to a photographable state
In conjunction with the distance between the objective lens and the eyepiece
The objective lens and eyepiece by increasing
Capture the subject by setting the optical relationship of The photographing lens moves from a photographable state to a retracted state.
In conjunction with this, the above-mentioned interval is narrowed and the objective lens is
A turtle with a finder characterized by being stored in the main body
La.